diff --git a/2014/playground.slide b/2014/playground.slide
index aa976a8..610e0ad 100644
--- a/2014/playground.slide
+++ b/2014/playground.slide
@@ -261,6 +261,12 @@
 
 5. The corresponding goroutines are woken up.
 
+* Sleeping fast
+
+Faking time allows precise sleep durations.
+
+.play playground/sleepfast.go
+
 * So there's no actual sleep?
 
 The playground's `write` syscall inserts a timestamp before each write.
@@ -303,7 +309,7 @@
 
 More about the Go tour:
 
-- Inside the Go: playground [[http://blog.golang.org/playground]]
+- Inside the Go playground: [[http://blog.golang.org/playground]]
 
 - The Go tour: [[http://tour.golang.org]]
 
diff --git a/2014/playground/sleepfast.go b/2014/playground/sleepfast.go
new file mode 100644
index 0000000..b53ddb1
--- /dev/null
+++ b/2014/playground/sleepfast.go
@@ -0,0 +1,16 @@
+package main
+
+import (
+	"fmt"
+	"time"
+)
+
+func main() {
+	start := time.Now()
+	fmt.Println(start)
+
+	for i := 0; i < 10; i++ {
+		time.Sleep(time.Nanosecond)
+		fmt.Println(time.Since(start))
+	}
+}